Possible Clues:

• Desirable flight option
• Indefinite number on street work incessantly
• All day long on street, no parking limits
• Old Poles in National Trust work continuously
• Vernon's to perform in part without a break
• Like some trains showing refusal after tip-off to carry tons for construction
• Constant vibration in pontoons -- but nothing's missing
• Round-the-clock refusal for the French street work
• Name working set of organ pipes without pausing
• Relentless surgeon finally looking into organ deficiency?